<template>
  <div id="app">
    <div class="container">
      <!-- 顶部框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="(item) in list" :key="item.id">
            <td>{{item.id}}</td>
            <td>{{item.name}}</td>

            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="{red: item.price > 100 }">{{item.price}}</td>
            <td>{{ formatDate(item.time)}}</td>
            <td><a  @click="btn(item.id)"  href="#" >删除</a></td>
          </tr>
          <tr>
            <td>统计</td>
            <td colspan="2">总价:{{totalPrice}}</td>
            <td colspan="2">均价:{{avaPrice}}</td>
          </tr>
        </tbody>
          
        <tfoot v-if="list.length === 0" >
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>
           
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input
            v-model.trim="name"
              type="text"
              class="form-control"
              placeholder="资产名称"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input
            v-model.number="price"
              type="text"
              class="form-control"
              placeholder="价格"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button @click.prevent="add" class="btn btn-primary">添加资产</button>
      </form>
    </div>
  </div>
</template>

<script>
 
 import moment from 'moment'
  
export default {
  data() {
    return {
      name: "", // 名称
      price: 0, // 价格
      list: [
        { id: 100, name: "外套", price: 199, time: new Date('2010-08-12')},
        { id: 101, name: "裤子", price: 34, time: new Date('2013-09-01') },
        { id: 102, name: "鞋", price: 25.4, time: new Date('2018-11-22') },
        { id: 103, name: "头发", price: 19900, time: new Date('2020-12-12') }
      ],
      // index:0
    };
  },
  methods:{
    // btn(index){
    //   this.list.splice(index,1)
    // },
     add(){
      if(this.name.length === 0 || this.price ===0 ){
        return alert('输入的内容不能为空，价格不能为0')
      }
      let id = this.list.length > 0 ? this.list[this.list.length - 1].id+1 : 100
      this.list.push({
        id ,
        name:this.name,
        price:this.price,
        time: new Date
      })
    },
    btn(id){
      let index = this.list.findIndex((item)=>{
        return item.id === id
      })
      this.list.splice(index,1)
    //  let index = this.list.findIndex(item=>item.id ==id)
      },
      formatDate(date){
        return moment(date).format('YYYY-MM-DD')
      }
    },
    computed:{
      totalPrice(){
        let sum =0
        this.list.forEach(item=>{
          sum+=item.price
        })
        return sum
      },

  avaPrice(){
        return(this.totalPrice/this.list.length).toFixed(2)
      }
    }
};
</script>

<style >
.red{
  color: red;
}
</style>